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C/2017 O1 (ASASSN) reaches its brightest

Dominic Ford, Editor
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Comet C/2017 O1 (ASASSN) is forecast to reach its brightest. It will lie at a distance of 1.49 AU from the Sun, and at a distance of 0.72 AU from the Earth.

From Ashburn, it will be visible in the morning sky, becoming accessible around 21:08, when it rises 21° above your north-eastern horizon. It will then reach its highest point in the sky at 04:16, 75° above your northern horizon. It will be lost to dawn twilight around 06:15, 65° above your north-western horizon.

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Based on the absolute magnitude published for this comet by the British Astronomical Association's Comet Section, we estimate that it may reach a peak brightness of around mag 9.

This comet is not expected to be visible to the naked eye, but might be visible through bird-watching binoculars. The brightnesses of comets are often highly unpredictable, since it is impossible to predict with certainty how they will respond as they are heated by the Sun as they move into the inner solar system. Magnitude estimates should be assumed to be highly provisional more than a few weeks in advance.

The path of the comet, on the other hand, can reliably be predicted. The chart below shows the path of C/2017 O1 (ASASSN) over the course of its apparition. It was produced using StarCharter and is available for download, either on dark background, in PNG, PDF or SVG formats, or on a light background, in PNG, PDF or SVG formats.

Alternatively, you can create a textual listing of the comet's position using's ephemeris generator.

The position of comet C/2017 O1 (ASASSN) at its brightest will be:

Object Right Ascension Declination Constellation Magnitude
Comet C/2017 O1 (ASASSN) 04h46m40s +53°04' Camelopardalis 8.9

The coordinates are given in J2000.0.

The sky on 16 October 2017
Twilight ends
Twilight begins

26-day old moon
Waning Crescent


26 days old

Rise Culm. Set
Mercury 07:47 13:15 18:43
Venus 05:35 11:40 17:44
Moon 04:06 10:36 17:05
Mars 05:03 11:15 17:27
Jupiter 07:58 13:25 18:52
Saturn 12:11 16:57 21:43
All times shown in EDT.


This event was automatically generated on the basis of orbital elements published by the Minor Planet Center (MPC) , and is updated whenever new elements become available. It was last updated on 22 Oct 2019.

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